{
  "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
  "contentVersion": "1.0.0.0",
  "parameters": {
    "workspace": {
      "type": "String"
    }
  },
  "resources": [
    {
      "apiVersion": "2024-01-01-preview",
      "id": "[concat(resourceId('Microsoft.OperationalInsights/workspaces/providers', parameters('workspace'), 'Microsoft.SecurityInsights'),'/alertRules/a35f2c18-1b97-458f-ad26-e033af18eb99')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/a35f2c18-1b97-458f-ad26-e033af18eb99')]",
      "properties": {
        "alertRuleTemplateName": "a35f2c18-1b97-458f-ad26-e033af18eb99",
        "customDetails": null,
        "description": "'Identifies when a user account has been added to a privileged built in domain local group or global group such as the Enterprise Admins, Cert Publishers or DnsAdmins. Be sure to verify this is an expected addition.'\n",
        "displayName": "User account added to built in domain local or global group",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "columnName": "SubjectAccount",
                "identifier": "FullName"
              },
              {
                "columnName": "SubjectUserName",
                "identifier": "Name"
              },
              {
                "columnName": "SubjectDomainName",
                "identifier": "NTDomain"
              }
            ]
          },
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "columnName": "SubjectUserSid",
                "identifier": "Sid"
              }
            ]
          },
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "columnName": "AddedMemberName",
                "identifier": "Name"
              },
              {
                "columnName": "AddedMemberSid",
                "identifier": "Sid"
              }
            ]
          },
          {
            "entityType": "Host",
            "fieldMappings": [
              {
                "columnName": "Computer",
                "identifier": "FullName"
              },
              {
                "columnName": "HostName",
                "identifier": "HostName"
              },
              {
                "columnName": "HostNameDomain",
                "identifier": "NTDomain"
              }
            ]
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Detections/SecurityEvent/UserAccountAddedToPrivlegeGroup_1h.yaml",
        "query": "// For AD SID mappings - https://docs.microsoft.com/windows/security/identity-protection/access-control/active-directory-security-groups\nlet WellKnownLocalSID = \"S-1-5-32-5[0-9][0-9]$\";\nlet WellKnownGroupSID = \"S-1-5-21-[0-9]*-[0-9]*-[0-9]*-5[0-9][0-9]$|S-1-5-21-[0-9]*-[0-9]*-[0-9]*-1102$|S-1-5-21-[0-9]*-[0-9]*-[0-9]*-1103$|S-1-5-21-[0-9]*-[0-9]*-[0-9]*-498$|S-1-5-21-[0-9]*-[0-9]*-[0-9]*-1000$\";\nunion isfuzzy=true\n(\nSecurityEvent\n// 4728 - A member was added to a security-enabled global group\n// 4732 - A member was added to a security-enabled local group\n// 4756 - A member was added to a security-enabled universal group\n| where EventID in (4728, 4732, 4756)\n| where AccountType == \"User\"\n| where TargetSid matches regex WellKnownLocalSID or TargetSid matches regex WellKnownGroupSID\n// Exclude Remote Desktop Users group: S-1-5-32-555\n| where TargetSid !in (\"S-1-5-32-555\")\n| extend SimpleMemberName = iff(MemberName == \"-\", MemberName, substring(MemberName, 3, indexof_regex(MemberName, @\",OU|,CN\") - 3))\n| project TimeGenerated, EventID, Activity, Computer, SimpleMemberName, MemberName, MemberSid, TargetAccount, TargetUserName, TargetDomainName, TargetSid, UserPrincipalName, \nSubjectAccount, SubjectUserName, SubjectDomainName, SubjectUserSid\n),\n(\nWindowsEvent\n// 4728 - A member was added to a security-enabled global group\n// 4732 - A member was added to a security-enabled local group\n// 4756 - A member was added to a security-enabled universal group\n| where EventID in (4728, 4732, 4756) and not(EventData has \"S-1-5-32-555\")\n| extend SubjectUserSid = tostring(EventData.SubjectUserSid)\n| extend Account =  strcat(tostring(EventData.SubjectDomainName),\"\\\\\", tostring(EventData.SubjectUserName))\n| extend AccountType=case(Account endswith \"$\" or SubjectUserSid in (\"S-1-5-18\", \"S-1-5-19\", \"S-1-5-20\"), \"Machine\", isempty(SubjectUserSid), \"\", \"User\")\n| extend MemberName = tostring(EventData.MemberName)\n| where AccountType == \"User\"\n| extend TargetSid = tostring(EventData.TargetSid)\n| where TargetSid matches regex WellKnownLocalSID or TargetSid matches regex WellKnownGroupSID\n// Exclude Remote Desktop Users group: S-1-5-32-555\n| where TargetSid !in (\"S-1-5-32-555\")\n| extend SimpleMemberName = iff(MemberName == \"-\", MemberName, substring(MemberName, 3, indexof_regex(MemberName, @\",OU|,CN\") - 3))\n| extend MemberSid = tostring(EventData.MemberSid)\n| extend TargetUserName = tostring(EventData.TargetUserName), TargetDomainName = tostring(EventData.TargetDomainName), \nTargetAccount = strcat(tostring(EventData.TargetDomainName),\"\\\\\", tostring(EventData.TargetUserName))\n| extend UserPrincipalName = tostring(EventData.UserPrincipalName)\n| extend SubjectUserName = tostring(EventData.SubjectUserName), SubjectDomainName = tostring(EventData.SubjectDomainName), \nSubjectAccount = strcat(tostring(EventData.SubjectDomainName),\"\\\\\", tostring(EventData.SubjectUserName))\n| project TimeGenerated, EventID, Computer, SimpleMemberName, MemberName, MemberSid, TargetAccount, TargetUserName, TargetDomainName, TargetSid, UserPrincipalName, \nSubjectAccount, SubjectUserName, SubjectDomainName, SubjectUserSid\n)\n| extend GroupAddedMemberTo = TargetAccount, AddedByAccount = SubjectAccount, AddedByAccountName = SubjectUserName, AddedByAccountDomainName = SubjectDomainName, \nAddedByAccountSid = SubjectUserSid, AddedMemberName = SimpleMemberName, AddedMemberSid = MemberSid\n| extend HostName = tostring(split(Computer, \".\")[0]), DomainIndex = toint(indexof(Computer, '.'))\n| extend HostNameDomain = iff(DomainIndex != -1, substring(Computer, DomainIndex + 1), Computer)\n| project-away DomainIndex\n",
        "queryFrequency": "P1D",
        "queryPeriod": "P1D",
        "severity": "Low",
        "subTechniques": [],
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "Persistence",
          "PrivilegeEscalation"
        ],
        "techniques": [
          "T1078",
          "T1098"
        ],
        "templateVersion": "1.3.8",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}